Cause
Campylobacteriosis is caused by bacteria called Campylobacter. Campylobacter jejuni, C. fetus, and C. coli are the types that usually cause the disease in people.
C. jejuni causes most cases of this foodborne disease. According to the Centers for Disease Control and Prevention, C. jejuni is the leading cause of bacterial diarrheal illness in the United States, affecting about 2.4 million people every year. The bacteria cause between 5 and 14 percent of all diarrheal illness worldwide. C. jejuni primarily affects children less than 5 years old and young adults 15 to 29 years old.